Photoelectron Spectra Samples - Weebly
Photoelectron Spectroscopy (PES) Sample Questions Questions 1-‐3 refer to the photoelectron spectrum of neon shown b elow:
Relative Number of Electrons
Photoelectron Spectrum of Neon www.APchemresources2014.weebly.com J. K. Howell
C
A
1000
B
800
600
400
200
0
Binding Energy (eV) 1. Peaks A, B, and C represent the binding energies of electrons in which subshells of neon? a. 1s, 2s, 2p
c. 1s, 1s, 1s
b. 2p, 2s, 1s
d. 2s, 2p, 2p
2. Which of the following statements best accounts for peak A being far to the left of peaks B and C: a. the electron configuration of n eon is 1s22s22p6 b. neon has 8 electrons located in its valence shell c. core electrons of an atom experience a much higher effective nuclear charge than valence electrons d. peaks B and C show first ionization energies of electrons in n eon, whereas p eak A shows the second ionization energy of n eon 3. Which of the following statements best accounts for peak C being three times the height of peak B: a. the intensity of the p hotoelectron signal at a given energy is a measure of the n umber of electrons in that energy level b. electrons represented b y peak B have approximately triple the binding energy than those represented by p eak C
c. in a photoelectron spectrum, as binding energy increases the relative number of electrons decreases d. the height of peaks in a photoelectron spectrum does not have any relation to the structure of the atom
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 1 of 4
4. Nitrogen shows 3 peaks in its photoelectron spectrum. These 3 peaks correspond to the binding energies of nitrogen’s 1s, 2s and 2p electrons. The relative heights of the 1s, 2s, and 2p peaks in the PES spectrum of nitrogen will be: a. 1, 1, 1 c. 1, 1, 2 b. 2, 2, 3 d. 2, 2, 5
5. If the binding energy of an electron is between 0 -‐ 10 eV, it can be assumed that the electron originated in: a. an s orbital c. a core orbital b. a p orbital d. a valence orbital
6. Shown b elow are the photoelectron spectra of nitrogen (atomic number 7) a nd fluorine (atomic number 9).
Relative Number of Electrons
Photoelectron Spectrum of Nitrogen www.APchemresources2014.weebly.com J. K. Howell
A
1000
800
600
400
B
200
C
0
Binding Energy (eV)
Relative Number of Electrons
Photoelectron Spectrum of Fluorine www.APchemresources2014.weebly.com J. K. Howell
1000
C
A
800
B
600
400
200
Binding Energy (eV)
0
Given the data in the two spectra, what do you expect the binding energy of the 1s electrons in oxygen (atomic number 8) to be? a. 0 -‐ 50 eV c. 400 -‐ 700 eV b. 50 -‐ 400 eV d. 700 -‐ 1000 eV
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 2 of 4
7. The photoelectron spectrum below shows the b inding energies for a ll electrons in n eutral element Z:
Relative Number of Electrons
Photoelectron Spectrum of Element Z www.APchemresources2014.weebly.com J. K. Howell
C
A
1300
B
1200
1100
200
D
100
0
Binding Energy (eV) What is the identity of element Z? a. boron b. carbon
c. neon d. magnesium
Questions 8-‐11 refer to the complete photoelectron spectrum of sodium shown b elow:
Relative Number of Electrons
Photoelectron Spectrum of Sodium www.APchemresources2014.weebly.com J. K. Howell
C
A
1300
1200
B
1100
200
100
D
0
Binding Energy (eV) 8. Identify the peak (A-‐D) in the photoelectron spectrum of s odium that represents the binding energy of electrons in the 2s orbital. 9. Identify the peak (A-‐D) in the photoelectron spectrum that gives the binding energy of sodium’s valence electrons. 10. Which peak ( A-‐D) in the photoelectron s pectrum of sodium shows electrons closest to the nucleus? 11. Which peak ( A-‐D) in the photoelectron s pectrum of sodium represents an orbital containing 6 electrons?
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 3 of 4
Questions 12 -‐ 15 refer to the complete photoelectron spectrum of n eutral element Q shown b elow:
Relative Number of Electrons
Photoelectron Spectrum of Element Q www.APchemresources2014.weebly.com J. K. Howell
C DE
B
A
1800
1700
1600
100
0
Binding Energy (eV) 12. The electrons that feel the strongest effective nuclear charge are given by which peak? a. A c. E b. B d. all electrons in this spectrum experience the same effective nuclear charge 13. Which peaks in the photoelectron s pectrum represent valence electrons of element Q? a. A only c. D and E b. B and C d. E only 14. Which peaks in the photoelectron s pectrum of Q are given by the binding energy of p orbital electrons? a. C only c. C and E b. D only d. B, C, and D 15. What is the identity of element Q? a. carbon c. magnesium b. oxygen d. silicon
Answers: 1. a 2. c 3. a 4. b 5. d
6. c 7. d 8. b 9. d 10. a
11. c 12. a 13. c 14. c 15. d
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 4 of 4
Relative Number of Electrons
Photoelectron Spectrum of Neon www.APchemresources2014.weebly.com J. K. Howell
C
A
1000
B
800
600
400
200
0
Binding Energy (eV) 1. Peaks A, B, and C represent the binding energies of electrons in which subshells of neon? a. 1s, 2s, 2p
c. 1s, 1s, 1s
b. 2p, 2s, 1s
d. 2s, 2p, 2p
2. Which of the following statements best accounts for peak A being far to the left of peaks B and C: a. the electron configuration of n eon is 1s22s22p6 b. neon has 8 electrons located in its valence shell c. core electrons of an atom experience a much higher effective nuclear charge than valence electrons d. peaks B and C show first ionization energies of electrons in n eon, whereas p eak A shows the second ionization energy of n eon 3. Which of the following statements best accounts for peak C being three times the height of peak B: a. the intensity of the p hotoelectron signal at a given energy is a measure of the n umber of electrons in that energy level b. electrons represented b y peak B have approximately triple the binding energy than those represented by p eak C
c. in a photoelectron spectrum, as binding energy increases the relative number of electrons decreases d. the height of peaks in a photoelectron spectrum does not have any relation to the structure of the atom
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 1 of 4
4. Nitrogen shows 3 peaks in its photoelectron spectrum. These 3 peaks correspond to the binding energies of nitrogen’s 1s, 2s and 2p electrons. The relative heights of the 1s, 2s, and 2p peaks in the PES spectrum of nitrogen will be: a. 1, 1, 1 c. 1, 1, 2 b. 2, 2, 3 d. 2, 2, 5
5. If the binding energy of an electron is between 0 -‐ 10 eV, it can be assumed that the electron originated in: a. an s orbital c. a core orbital b. a p orbital d. a valence orbital
6. Shown b elow are the photoelectron spectra of nitrogen (atomic number 7) a nd fluorine (atomic number 9).
Relative Number of Electrons
Photoelectron Spectrum of Nitrogen www.APchemresources2014.weebly.com J. K. Howell
A
1000
800
600
400
B
200
C
0
Binding Energy (eV)
Relative Number of Electrons
Photoelectron Spectrum of Fluorine www.APchemresources2014.weebly.com J. K. Howell
1000
C
A
800
B
600
400
200
Binding Energy (eV)
0
Given the data in the two spectra, what do you expect the binding energy of the 1s electrons in oxygen (atomic number 8) to be? a. 0 -‐ 50 eV c. 400 -‐ 700 eV b. 50 -‐ 400 eV d. 700 -‐ 1000 eV
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 2 of 4
7. The photoelectron spectrum below shows the b inding energies for a ll electrons in n eutral element Z:
Relative Number of Electrons
Photoelectron Spectrum of Element Z www.APchemresources2014.weebly.com J. K. Howell
C
A
1300
B
1200
1100
200
D
100
0
Binding Energy (eV) What is the identity of element Z? a. boron b. carbon
c. neon d. magnesium
Questions 8-‐11 refer to the complete photoelectron spectrum of sodium shown b elow:
Relative Number of Electrons
Photoelectron Spectrum of Sodium www.APchemresources2014.weebly.com J. K. Howell
C
A
1300
1200
B
1100
200
100
D
0
Binding Energy (eV) 8. Identify the peak (A-‐D) in the photoelectron spectrum of s odium that represents the binding energy of electrons in the 2s orbital. 9. Identify the peak (A-‐D) in the photoelectron spectrum that gives the binding energy of sodium’s valence electrons. 10. Which peak ( A-‐D) in the photoelectron s pectrum of sodium shows electrons closest to the nucleus? 11. Which peak ( A-‐D) in the photoelectron s pectrum of sodium represents an orbital containing 6 electrons?
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 3 of 4
Questions 12 -‐ 15 refer to the complete photoelectron spectrum of n eutral element Q shown b elow:
Relative Number of Electrons
Photoelectron Spectrum of Element Q www.APchemresources2014.weebly.com J. K. Howell
C DE
B
A
1800
1700
1600
100
0
Binding Energy (eV) 12. The electrons that feel the strongest effective nuclear charge are given by which peak? a. A c. E b. B d. all electrons in this spectrum experience the same effective nuclear charge 13. Which peaks in the photoelectron s pectrum represent valence electrons of element Q? a. A only c. D and E b. B and C d. E only 14. Which peaks in the photoelectron s pectrum of Q are given by the binding energy of p orbital electrons? a. C only c. C and E b. D only d. B, C, and D 15. What is the identity of element Q? a. carbon c. magnesium b. oxygen d. silicon
Answers: 1. a 2. c 3. a 4. b 5. d
6. c 7. d 8. b 9. d 10. a
11. c 12. a 13. c 14. c 15. d
Jennifer K. Howell & Jennifer Pitt-‐Lainsbury for www.APchemresources2014.weebly.com, 2013 page 4 of 4
